This depends on several factors: whether you are a free player or a member, and if you want to train all of your combat skills. My guess would be an average of about six months, but this wouldn't be a "pure" account.
Training on coal at seers coal mine is probably the best way to get it faster.
It depends how long you are on Runescape.
1000 billion / 4.5 billion = 1000/4.5 = 222.22... years.
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Not that long, it's almost instant.
Go to:runescpae
about 30sec or 1min
well if you played runescape 24/7 it would take probealy take 2-3 days to do .
millions of years
If you just started RuneScape maybe 30 minutes and if you already have a RuneScape account 7 minutes minimum.
It just depends on your behavior.
depends on what your cooking